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неизменность n stresses
gen.	绎; 永久性; 永恒不变; 恒等性 (invariance)
busin.	不变性; 固定性
math.	持久，存留
stat.	持久; 存留
tech.	永恒性; 不变性; 恒定性

неизменность: 11 phrases in 5 subjects

Business	1
General	6
Law	1
Mathematics	1
Technology	2